Harold workman



N0. 6|l,953. Patented Oct. 4, I898. H. WORKMAN.

WATER TUBE. STEAM BOILER.

(Application filed May 21, 1898.)

(No Model.)

INV'ENTOR HHROLDWORKMAN H\6 R'rronNEYS 1n: NORRIS Pzrzns co.PHDTQL'ITHQ, WASHINGTON, o. c.

section.

rare,

HAROLD VVORKMAN, OF DU-LLATUR, SCOTLAND.

'WATJER-TUVBE STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 611,953, dated October4, 1898.

Application filed May 21, 1898- garial No. 681,352. (No model.) I

To all whom it may concern.-

Be it known that I, HAROLD WORKMAN, a subject of the Queen of GreatBritain and Ireland, and a resident of Dunluce, Dullatur,

in the county of Dumbarton, Scotland, have invented certain newanduseful Improvements in VVater-Tube Steam-Boilers, (for which I haveapplied for British Patent, No. 25,164, dated October 30, 1897,) ofwhich the following is a specification.

My said invention comprises new or improved arrangements or combinationsof the parts of water-tube steam-boilers of the kind having stacks oftubes through which the water flows downward automatically.

According to my present invention I combine with what may bedistinguished as the upper descending tubes one or more lower groups oftubes in each section, which tubes, with suitable junction-boxes, arearranged to act as water-ascending tubes, the lowest of these beingconnected to the lowest of the other higher descending tubes, and thehighest of the ascending tubes being connected by one or morereturn-tubes for eachsection to a water-and-steam drum. The lower tubesmay be arranged so as to form a combustionspace above the lowest layerof tubes; and in order that my said invention and the manner ofperforming the same may be properly understood I hereunto append a sheetof explanatory drawings, showing in two vertical sections Figures 1 and2 as at right angles to each other a boiler as made with myimprovements.

In the boiler shown in the drawings there is an upper portion ofhorizontal or slightlyinclined water-tubes A, arranged in verticalsections, each section comprising a double row of tubes A. There may beonly one or more than two vertical rows of tubes in each The tubes A arefixed at their ends in junction-boxes B O, made'with compartmentsarranged so that in each section groups of four tubes A communicatethrough the junction-boxes with each lower or upper set of four tubesalternately at opposite ends, so that a continuous serpentine passage isformed, and the water flows through succes sive lower groups of tubesalternately in opposite directions between the junction-boxes B C. Thetop group of four tubes A in each sole steam-space or which may beconnected to a higher steam-drum.

The lowest group of four water-descending tubes A in each section areconnected at one end by a long junction-box F with two small tubes G andone larger tube 1 1, which tubes G H are connected through a similar boxJ with a group of tubes K, which in their turn communicate through asmall box L with another groupof tubes M, which latter are connected bya return-tube N for each section 'to the water-and-steam drum.

v The fire-gases from the furnace or furnaces P beneath each stack oftubes are prevented from ascending directly among the tubes by a liningof fire-clay Q or other suitable material placed on and between thegroup of tubes G, and the fire-gases pass by a lateral flue R (which maybe on one side or on each side) into a combustion-space S, between thetubes G and K. The tubes G, H, K, and M act as water-ascending tubes,and the greater heat from the furnace acting on these ascending tubescauses a vigorous flow of the water (mixed with steam) through them andthe return-tubes N in a general upward direction to the drum E. Thefiregases ascending among the tubes have their heat more and moreabsorbed as they rise, and the water becomes more and more heated as itdescends through the descending tubes A. i

What I claim as my invention is 1. In a water-tube steam-boiler, a stackof horizontal or slightly-inclined tubes in two portions, an upper and alower portion, the

tubes in the upper portion being connected with each other to formcontinuous zigzag or backward and forward and generally downwardpassages from the uppermost tubes,a water-and-steam drum ,to the lowerpart of which the uppermost tubes are connected, the lowermost tubes ofthe upper portion of the stack being connected with the lowermost tubesof the lower portion, and the uppermost tubes of the lower portion beingconnected to the water-and-steam drum, while the uppermost and lowermostand intermediate tubes of the lower portion are connected with eachother to form zigzag or backward and forward passages, the flow of waterbeing downward through the upper portion and upward through the lowerportion of the stack, substantially as herein set forth.

2. A Water-tube steam-boiler comprising a stack of horizontal orslightly-inclined tubes connected with each other, the lowermost tubesbeing at a distance below the next higher tubes to form acombustion-space, with a furnace-space and a lateral flue on one side

